structure of the atom

By cpierce980
  • 450

    Democritus

    450 B.C.
    Democritus creates the first atomic theroy that all matter is made up of particles called atoms
  • Period: 450 to

    History Of the Atom

  • John Dalton, Atomic theroy

    John Dalton comes up with an updated atomic theroy in which there are spherical solid atoms based upon measurable properties of mass

  • Law of Definite Proportions

    Joseph Proust states that a chemical compound always contains the exact same proportion of elements by mass

  • Plum Pudding Model

    J.J. Thomson proposed a model in which a disperesed positive charge in the atom balances out the electrons that dot the atom making it look akin to plum pudding

  • R. A. Milika, Oil Drop experiment

    R. A. Milika preforms the Oil Drop Experiment, the experiment proves the mass and charge of an electron

  • Gold Foil Experiment

    Ernest Rutheford prefroms the Gold foil experiment, using alpha particles and shooting them at a piece of gold foil he finds that some reflect back he discovers the nucleus and disproves the plum pudding model

  • Nuclear model

    Rutherford with his results of the Gold Foil experiment creates a new model in which the atom has a relativly high central charge concentrated into a very small volume in comparison to the rest of the atom, The central part contains most of the atomic mass

  • The Bohr Model

    Niels Bohr creates a model in which the electrons orbit the nucleus simular to the solar system and stay in thier "orbits" due to atraction by electrostatic forces

  • Spherical Model

    M. Kac proposes the Spherical Model, the Spherical Model is a model of ferromagnetism that when applied to systems of dimension greater than four the critical exponents that govern the behavior of the system near the critical point can be solved

  • Quantum Mechanical Model

    Erwin Shcrodinger creates a model that uses mathmatics to describe the likelihood of finding an electron in a certain position

  • Uncertainty Principle

    Heisnburg explains that the uncertainty principle is a variety of mathmatical ineualities asserting a fundemental limit to the precision with which certain pairs of physical porportions of complementry varibles can be know i.e postion and momentum of electrons

  • Paul Dirac

    Paul Dirac formulated the Dirac equation, which describes the behaviour of fermions and predicted the existence of antimatter.

  • Discovery of the nuetron

    James Chadwick uses alpha particles to find a nuetral atomic particle with mass close to that of a proton that resides in the nucleus, he names it the nuetron